Thanks for the information. It seems to me that I took a right side set from a 66 Coronet and the body guy made it work on the left. Might have been left to right, but it was done.Maybe your 66 got 67 fenders or Charger fenders put on it at some point? Can you see where metal was cut or spotwelds drilled. Does it have threaded inserts to mount the headlight brackets?
66 coronets are welded on
67 coronets bolt on after the new car was painted.
66-67 Charger are bolt on
66-67 Plymouth are welded on and very different from each other and the Dodges. The front of the Plymouth fender is very different and much shorter.